[WIP] REFACTOR: parseRange func & error messages

[nidhey27]

Closes: #1000

Description:

Refactor parseRange Function

This PR refactors the parseRange function in the cron file to enhance error handling and improve parsing logic. The changes include:

• Updated Error Handling:

  • Enhanced error messages for errOutOfRange and errParsing to provide clearer and more accurate information.

• Refactored Functions:

  • parseRange: Improved error handling and parsing logic for ranges and individual values.
  • processPart: Refined handling of both value and range parts.
  • handleValue: Enhanced error reporting for out-of-range values.
  • handleRange: Added checks for invalid range formats and adjusted error messages.

• Added Unit Tests:

  • Comprehensive tests for processPart, handleValue, and handleRange to cover various edge cases and validate the refactored logic.

Checklist:

• [x] I have formatted my code using goimport and golangci-lint.
• [x] All new code is covered by unit tests.
• [x] This PR does not decrease the overall code coverage.
• [ ] I have reviewed the code comments and documentation for clarity.

Thank you for your contribution!